MVC Framework Routing principle

Many PHP frameworks have been used so far, such as: Zendframework,thinkphp,yii,slim. But the principle of the framework has not been studied yet.

Today, first look at the principle of the MVC framework in the middle:

The so-called routing, is the program according to the browser URL to the program distribution processing (jump) function code.

When we use the framework, we will find that the general URL request is this: LOCALHOST/USER/LOGIN/1, in this URL we are not difficult to find: The user is the name of the controller, and login is the current controller method name, 1 is the passed parameter (possibly the user class).

Let's take a look at the route:

The directory structure for creating a general MVC framework is as follows:

App

--application

----controllers

----Models

----views

--library//Introduction to the library or general method

--public

----Config

------config.php

----index.php//import file

----. htaccess

The principle of routing: The program obtains the request parameter on the URL with $_server, obtains the corresponding position parameter, then loads the corresponding controller method and executes.

A simple example:

Add code to index.php in public:

 <?php define (' Propath ', ' D:/xampp/htdocs/app ');   $root = $_server[' script_name ');     $request = $_server[' Request_uri ');      $URI = Array ();     $url = Trim (Str_replace ($root, ", $request), '/');       # if NULL, the access root address if (empty ($url)) {# Default Controller and default method $class = ' index ';   $func = ' index ';         } else {$URI = explode ('/', $url);           # If function is empty, the default access to index if (count ($URI) < 2) {$class = $URI [0];       $func = ' index ';           } else {$class = $URI [0];       $func = $URI [1]; Load the corresponding class file include (Propath. ‘/’ . ' application/controllers/'. $class.     '. php ');     # instantiation $className = Ucfirst ($class); $obj = new $className ();    Call_user_func_array (///See previous article # Call internal function array ($obj, $func), # Pass parameter Array_slice ($URI, 2)); 

<?php        define (' Propath ', ' D:/xampp/htdocs/app ');   $root = $_server[' script_name ');   $request = $_server[' Request_uri ');     $URI = Array ();      $url = Trim (Str_replace ($root, ", $request), '/');     # if NULL, the access root address   if (empty ($url))   {       # Default Controller and default method       $class = ' index ';       $func = ' index ';   }   else  {       $URI = explode ('/', $url);         # If function is empty, the default access to index       if (count ($URI) < 2)       {           $class = $URI [0];           $func = ' index ';       }       else      {           $class = $URI [0];           $func = $URI [1];       }   }   # load the corresponding class file  include (Propath. ‘/’ . ' application/controllers/'. $class. '. php ');     # instantiation   $className = Ucfirst ($class); $obj = new $className ();     Call_user_func_array (   //See previous article    # Call internal function       Array ($obj, $func),        # Pass parameter       array_slice ($ URI, 2)   );   

Next, add a file in the controllers:

index.php

<?php     class index   {        public  function Index ()       {           echo ' I am default controller ';       }       Public  function Hello ()       {           echo ' Hello word! ';       }      Public Function name ($name)       {           echo ' hello '. $name;       }  }       ? >  

<?php     class index   {        public  function Index ()       {           echo ' I am default controller ';       }       public  function Hello ()       {           echo ' Hello word! ';       }      Public Function name ($name)       {           echo ' hello '. $name;       }  }       ? >  

OK. Below we can test.

Browser input: Localhost/index/index page output: I am Default Controller

Browser input: Localhost/index/hello page output: Hello word!

Browser input: Localhost/index/name/jack page output: Hello Jack

This allows for simple routing.

MVC Framework Routing principle